import java.util.AbstractMap;
import java.util.Map;
import java.util.Set;

public class MapImpl1 extends AbstractMap<Object,Object> implements Map<Object,Object> {
    @Override
    public Set<Entry<Object, Object>> entrySet() {
        return null;
    }
    static {
        System.out.println(MapImpl1.class.getName()+" init...");
    }
}
